Looking for a good spam filter for Outlook? I've been using Cloudmark's SpamNet service for blocking spam in Outlook for about 8 months or so—since beta 4 or so—and I've found it to work tremendously. Now that the product is out of beta, they've gone to a commercial product and now charge a service fee for each month.
Anyway, the normal fee is $4.99 a month, but for a limited time they're offering it at a locked price of $3.99. I can do you better though. If you subscribe using my referral code of "hzx4hl" you can not only get the service for $1.99 for the first year (from the time of purchase) you'll also give me a free month of service. Ok, so the second thing benefits me, but you can sign up for the service for half the normal cost. I get enough e-mail that the service is easily worth $2 a month. It captures 99.9% of my spam—which adds up to several thousand e-mails a week. That's much better than weeding through them all on my own. Anyway, I find it's a top notched product and well worth paying for.